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Significant accounting policies - Other liabilities (Details) - item | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant accounting policies |  |  |
Number of month's salary required for the payment of single lump sum | 1 |  |
Period of service calculated to pay benefits | 5 years |  |
Period for payment of legal fee | 12 months |  |
Minimum |  |  |
Significant accounting policies |  |  |
Discount rate | 4.60% | 4.80% | 6.50%
Projected increase rate in compensation | 8.00% | 8.00% | 12.00%
Maximum |  |  |
Significant accounting policies |  |  |
Discount rate | 9.20% | 6.20% | 8.50%
Projected increase rate in compensation | 16.30% | 22.50% | 26.80%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Number of month's salary to be considered for the payment of benefits. + References No definition available. + Details
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- Definition The period during which the legal fee is to be paid in consecutive installments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period of service calculated to pay benefits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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